Males and females that instantly don shorts and/or flip flops as soon as it's April 1st, regardless of the temperature. These people will then complain for the entire day about how cold it is and demand that April be warmer.
Most often spotted at the mall.

The first of April every year. According to Lisa Simpson, this is when the Christians changed thier calender to January, and the pagans kept it at the first of April. The people who did not change were called april fools, and thier day was sabotaged by Christians for fun.

n. When a man is engaging in anal sex with a partner and comunicates to the partner that he is finished, then as the partner turns around he is greeted by skeet in the face and eyes while hearing "April Fools!"
On all other days this is known as a Houdini